X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=gitmo%2FMouse.git;a=blobdiff_plain;f=lib%2FMouse%2FAttribute.pm;h=bc897ab667fd310fe875441e7985f0a3e6dd3a2a;hp=4c2caf0a9955b2eafdc5e0996338551ef76f184e;hb=3301fa546394abbef62f5a7f9bbfc1c49ae6eb50;hpb=a707f5877879f294bbaa3d0744ddd021c6a2ca9b

diff --git a/lib/Mouse/Attribute.pm b/lib/Mouse/Attribute.pm
index 4c2caf0..bc897ab 100644
--- a/lib/Mouse/Attribute.pm
+++ b/lib/Mouse/Attribute.pm
@@ -4,6 +4,7 @@ use strict;
 use warnings;
 
 use Carp 'confess';
+use Scalar::Util 'blessed';
 
 sub new {
     my $class = shift;
@@ -18,46 +19,56 @@ sub new {
 
 sub name            { $_[0]->{name}            }
 sub class           { $_[0]->{class}           }
+sub _is_metadata    { $_[0]->{is}              }
+sub is_required     { $_[0]->{required}        }
 sub default         { $_[0]->{default}         }
+sub is_lazy         { $_[0]->{lazy}            }
 sub predicate       { $_[0]->{predicate}       }
 sub clearer         { $_[0]->{clearer}         }
 sub handles         { $_[0]->{handles}         }
 sub weak_ref        { $_[0]->{weak_ref}        }
 sub init_arg        { $_[0]->{init_arg}        }
 sub type_constraint { $_[0]->{type_constraint} }
+sub trigger         { $_[0]->{trigger}         }
+sub builder         { $_[0]->{builder}         }
+
+sub has_default         { exists $_[0]->{default}         }
+sub has_predicate       { exists $_[0]->{predicate}       }
+sub has_clearer         { exists $_[0]->{clearer}         }
+sub has_handles         { exists $_[0]->{handles}         }
+sub has_weak_ref        { exists $_[0]->{weak_ref}        }
+sub has_init_arg        { exists $_[0]->{init_arg}        }
+sub has_type_constraint { exists $_[0]->{type_constraint} }
+sub has_trigger         { exists $_[0]->{trigger}         }
+sub has_builder         { exists $_[0]->{builder}         }
 
 sub generate_accessor {
     my $attribute = shift;
 
-    my $name       = $attribute->{name};
-    my $key        = $attribute->{init_arg};
-    my $default    = $attribute->{default};
-    my $trigger    = $attribute->{trigger};
-    my $type       = $attribute->{type_constraint};
-
-    my $constraint = sub {
-        return unless $type;
-
-        my $checker = Mouse::TypeRegistry->optimized_constraints->{$type};
-        return $checker if $checker;
-
-        confess "Unable to parse type constraint '$type'";
-    }->();
+    my $name       = $attribute->name;
+    my $key        = $attribute->init_arg;
+    my $default    = $attribute->default;
+    my $trigger    = $attribute->trigger;
+    my $type       = $attribute->type_constraint;
+    my $constraint = $attribute->find_type_constraint;
 
     my $accessor = 'sub {
         my $self = shift;';
 
-    if ($attribute->{is} eq 'rw') {
+    if ($attribute->_is_metadata eq 'rw') {
         $accessor .= 'if (@_) {
             local $_ = $_[0];';
 
         if ($constraint) {
-            $accessor .= 'Carp::confess("Attribute ($name) does not pass the type constraint because: Validation failed for \'$type\' failed with value $_") unless $constraint->();'
+            $accessor .= 'do {
+                my $display = defined($_) ? $_ : "undef";
+                Carp::confess("Attribute ($name) does not pass the type constraint because: Validation failed for \'$type\' failed with value $display") unless $constraint->();
+            };'
         }
 
         $accessor .= '$self->{$key} = $_;';
 
-        if ($attribute->{weak_ref}) {
+        if ($attribute->weak_ref) {
             $accessor .= 'Scalar::Util::weaken($self->{$key});';
         }
 
@@ -70,9 +81,9 @@ sub generate_accessor {
     else {
     }
 
-    if ($attribute->{lazy}) {
+    if ($attribute->is_lazy) {
         $accessor .= '$self->{$key} = ';
-        $accessor .= ref($attribute->{default}) eq 'CODE'
+        $accessor .= ref($default) eq 'CODE'
                    ? '$default->($self)'
                    : '$default';
         $accessor .= ' if !exists($self->{$key});';
@@ -86,7 +97,7 @@ sub generate_accessor {
 
 sub generate_predicate {
     my $attribute = shift;
-    my $key = $attribute->{init_arg};
+    my $key = $attribute->init_arg;
 
     my $predicate = 'sub { exists($_[0]->{$key}) }';
 
@@ -95,7 +106,7 @@ sub generate_predicate {
 
 sub generate_clearer {
     my $attribute = shift;
-    my $key = $attribute->{init_arg};
+    my $key = $attribute->init_arg;
 
     my $predicate = 'sub { delete($_[0]->{$key}) }';
 
@@ -104,12 +115,12 @@ sub generate_clearer {
 
 sub generate_handles {
     my $attribute = shift;
-    my $reader = $attribute->{name};
+    my $reader = $attribute->name;
 
     my %method_map;
 
-    for my $local_method (keys %{ $attribute->{handles} }) {
-        my $remote_method = $attribute->{handles}{$local_method};
+    for my $local_method (keys %{ $attribute->handles }) {
+        my $remote_method = $attribute->handles->{$local_method};
 
         my $method = 'sub {
             my $self = shift;
@@ -151,22 +162,23 @@ sub create {
     $meta->add_attribute($attribute);
 
     # install an accessor
-    if ($attribute->{is} eq 'rw' || $attribute->{is} eq 'ro') {
+    if ($attribute->_is_metadata eq 'rw' || $attribute->_is_metadata eq 'ro') {
         my $accessor = $attribute->generate_accessor;
         no strict 'refs';
         *{ $class . '::' . $name } = $accessor;
     }
 
     for my $method (qw/predicate clearer/) {
-        if (exists $attribute->{$method}) {
+        my $predicate = "has_$method";
+        if ($attribute->$predicate) {
             my $generator = "generate_$method";
             my $coderef = $attribute->$generator;
             no strict 'refs';
-            *{ $class . '::' . $attribute->{$method} } = $coderef;
+            *{ $class . '::' . $attribute->$method } = $coderef;
         }
     }
 
-    if ($attribute->{handles}) {
+    if ($attribute->has_handles) {
         my $method_map = $attribute->generate_handles;
         for my $method_name (keys %$method_map) {
             no strict 'refs';
@@ -177,6 +189,34 @@ sub create {
     return $attribute;
 }
 
+sub find_type_constraint {
+    my $self = shift;
+    my $type = $self->type_constraint;
+
+    return unless $type;
+
+    my $checker = Mouse::TypeRegistry->optimized_constraints->{$type};
+    return $checker if $checker;
+
+    return sub { blessed($_) && blessed($_) eq $type };
+}
+
+sub verify_type_constraint {
+    my $self = shift;
+    local $_ = shift;
+
+    my $type = $self->type_constraint
+        or return 1;
+    my $constraint = $self->find_type_constraint
+        or return 1;
+
+    return 1 if $constraint->($_);
+
+    my $name = $self->name;
+    local $_ = "undef" unless defined($_);
+    Carp::confess("Attribute ($name) does not pass the type constraint because: Validation failed for \'$type\' failed with value $_");
+}
+
 1;
 
 __END__